sensor TOYOTA RAV4 1996 Service Repair Manual

Q08867
Junction Connector
Fuse Block
FL Block
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
DI−229
1996 RAV4 (RM447U)
Pattern Select Switch Circuit
CIRCUIT DESCRIPTION
The ECM memory contains the shift programs for the NORMAL and POWER patterns, 2 and L position and
the lock−up patterns. Following the programs corresponding to the signals from the pattern select switch,
the park / neutral position switch and other various sensors, the ECM switches the solenoid valves ON and
OFF, and control the transmission gear change and the lock−up clutch operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of PWR indicator light.
CHECK:
Check if the PWR indicator light normally when the pattern select switch is set to NORM and PWR position.
OK:
Pattern select switchPWR indicator light
PWRLight up
NORMGoes off
NG Check and repair PWR indicator light (See page
BE−37).
OK
DI41B−02

DI41C−02
Vehicle Brought to Workshop
Customer Problem Analysis
P. DI−233
Check and Clear DTC (Pre−check)
P.
DI−234
Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the indicated pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation
P. IN−30
Symptom
does not occur
Symptom
occurs
DTC Check
P. DI−234
Sensor CheckCircuit Inspection
P. DI−246 −DI−282
DTC Chart
P. DI−239Problem Symptoms Table
P. DI−245
Check for Fluid Leakage
P. DI−282
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
Step 8:Diagnostic steps permitting the use of the
TOYOTA hand−held tester, or TOYOTA
brake−out−box.
DI−232
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
ANTI−LOCK BRAKE SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshooting in accordance with the procedure on the following pages.

F15316
E1
TsTc DLC1
BR3904
0.13 sec. 0.13 sec.
ON
OFF
BR3893
72 67
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec.4 sec.
Repeat Malfunction Code (Example Code 72, 76) DI−236
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
2. SPEED SENSOR SIGNAL CHECK
(a) Check the speed sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E1 of the
DLC1.
SST 09843−18020
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI−275).
(5) Drive vehicle straight forward.
HINT:
Drive vehicle faster than 45 km/h (28 mph) for several seconds.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E1 of the
DLC1.
SST 09843−18020
(8) Read the number of blinks of the ABS warning light.
HINT:
See the list of DTC shown on the next page.
If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect terminals Ts and
E1, and Tc and E1 of the DLC1, and turn the ignition
switch OFF.

− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−237
1996 RAV4 (RM447U)
(b) Check the DTC of the sensor function.
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensor
Right front speed sensor
Sensor installation
Sensor rotor
72Low output voltage of left front speed sensor
Left front speed sensor
Sensor installation
Sensor rotor
73Low output voltage of right rear speed sensor
Right rear speed sensor
Sensor installation
Sensor rotor
74Low output voltage of left rear speed sensor
Left rear speed sensor
Sensor installation
Sensor rotor
75Abnormal change in output voltage of right front speed sensorRight front speed sensor rotor
76Abnormal change in output voltage of left front speed sensorLeft front speed sensor rotor
77Abnormal change in output voltage of right rear speed sensorRight rear speed sensor rotor
78Abnormal change in output voltage of left rear speed sensorLeft rear speed sensor rotor
*79Deceleration sensor is faultyDeceleration sensor
Sensor installation
*: 4WD models

R10305
GL2GL1
VGS
GGND
Rear Side
Front Side
DI−238
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
3. DECELERATION SENSOR OPERATION DIAGNOSIS
SYSTEM
CAUTION:
While checking the deceleration sensor operating diagno-
sis system, the Anti−lock Brake System does not work and
brake system works as a conventional brake system.
Check the deceleration sensor output.
(1) Connect 3 dry batteries of 1.5 V in series.
(2) Connect VGS terminal to the batteries’ positive (+)
terminal, and GGND terminal to the batteries’ nega-
tive (−) terminal, apply about 4.5 V between VGS−
GGND terminals.
NOTICE:
Do not apply voltage of 6 V or more to terminals VGS and
GGND.
(3) Check the output of GL1 and GL2 terminals.
SymbolsConditionStandard Value
GL1Horizontalabout 2.3 V
GL1Lean forward0 − about 2.3 V
GL1Lean rearwardabout 2.3 V − 4.5 V
GL2Horizontalabout 2.3 V
GL2Lean forwardabout 2.3 V − 4.5 V
GL2Lean rearward0 − about 2.3 V
HINT:
If the senor is tilted too much it may show the wrong value.
If dropped, the sensor should be replaced with a new one.
The sensor removed from the vehicle should not be
placed upside down.

DI41F−02
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−239
1996 RAV4 (RM447U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code. For details
of each code, turn to the page referred to under the ”See page” for the respective ”DTC No.” in the DTC chart.
HINT:
Using SST 09843−18020, connect the terminals Tc and E1, and remove the short pin.
If any abnormality is not found when inspect each inspection parts, inspect the ECU.
DTC No.
(See page)Detection ItemTrouble Area
11
(DI−246)Open circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
(DI−246)Short circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
*3 13
(DI−250)Open circuit in ABS control (motor) relay circuit
ABS control (motor) relay
Open or short in ABS control (motor) relay circuit
ECU
14
(DI−250)Short circuit in ABS control (motor) relay circuit
ABS control (motor) relay
B+ short in ABS control (motor) relay circuit
ECU
21
(DI−254)Open or short circuit in 2−position solenoid circuit for right front
wheelABS actuator
Open or short in SFRR or SFRH circuit
ECU
22
(DI−254)Open or short circuit in 2−position solenoid circuit for left front
wheelABS actuator
Open or short in SFLR or SFLH circuit
ECU
23
(DI−254)Open or short circuit in 2−position solenoid circuit for right rear
wheelABS actuator
Open or short in SRRR or SRRH circuit
ECU
24
(DI−254)Open or short circuit in 2−position solenoid circuit for left rear
wheelABS actuator
Open or short in SRLR or SRLH circuit
ECU
*3 31
(DI−257)Right front wheel speed sensor signal malfunction
Right front, left front, right rear or left rear speed sensor
Open or short in each speed sensor circuit
Speed rotor
ECU*3 32
(DI−257)Left front wheel speed sensor signal malfunction
*3 33
(DI−257)Right rear wheel speed sensor signal malfunction
*3 34
(DI−257)Left rear wheel speed sensor signal malfunction
*2 35
(DI−257)Open circuit in speed sensor circuitOpen in speed sensor circuit
*1 37
(DI−261)Some tire is different size from other tiresTire size
ECU
41
(DI−262)Low battery positive voltage
Abnormal high battery positive voltage (2WD Vehicles)
Battery
IC regulator
Open or short in power source circuit
ECU
*2 43
(DI−266)Malfunction in deceleration sensor (constant output)
Deceleration sensor
Wire harness for deceleration sensor system
ECU

DI−240
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)*
2 44
(DI−267)Open or short in deceleration sensor circuit
Deceleration sensor
Open or short in deceleration sensor circuit
ECU
*2 45
(DI−266)Malfunction in deceleration sensorDeceleration sensor
Wire harness for deceleration sensor system
51
(DI−269)Pump motor is locked
Open in pump motor groundABS pump motor
Always ON
(DI−270)Malfunction in ECU
Abnormal high battery positive voltage (2WD Vehicles)
Battery *1
IC regulator *1
Open or short in pwer source circuit *1
ECU
*1: 2WD models
*
2: 4WD models
*
3: As the DTC cannot be erased by replacing parts alone, do either of the following operations.
1. Clear DTC (See page DI−234).
2. At the vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.

DI41I−02
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−245
1996 RAV4 (RM447U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
SymptomsSuspected AreaSee page
ABS does not operate
Only when 1 − 4 are all normal and the problem is still occuring, replace the ABS
ECU
2. Check the DTC, reconfirming that the normal code is output
3. IG power source circuit
4. Speed sensor circuit
5. Check the ABS actuator with a checker
If abnormal, check the hydraulic circuit for leakage (See page DI−282)
DI−234
DI−262
DI−257
BR−35
ABS does not operate effi-
ciently
Only when 1 − 4 are all normal and the problem is still occuring, replace the ABS
ECU
1. Check the DTC, reconfirming that the normal code is output
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the ABS actuator with a checker
If abnormal, check the hydraulic circuit for leakage (See page DI−282)
DI−234
DI−257
DI−273
BR−35
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI−275
−
DTC check cannot be done
Only when 1 and 2 are all normal and the problem is still occuring, replace the ABS
ECU
1. ABS warning light circuit
2. Tc terminal circuit
DI−275
DI−278
Speed sensor signal check
cannot be done1. Ts terminal circuit
2. ABS ECUDI−280
−

BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
Low Speed High SpeedN S
+V
−V
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−257
1996 RAV4 (RM447U)
DTC 31, 32, 33, 34, 35 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS system. The front and rear rotors each have 48 serra-
tions.
When the rotor rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.DTC Detecting ConditionTrouble Area
31, 32, 33, 34
Detection of any of conditions 1 through 3:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are not
input for 5 sec.
2. Momentary interruption of the speed sensor signal occurs
at least 7 times in the time between switching the ignition
switch ON and switching it OFF
3. Abnormal fluctuation of speed sensor signals with the ve-
hicle speed 20 km/h (12 mph) or more
Right front, left front, right rear or left rear speed sensor
Open or short in each speed sensor circuit
Sensor rotor
ECU
*35
Speed sensor signal is not input for about 1 sec. while the
speed sensor signals are being checked at vehicle speed of 0
km/hOpen in speed sensor circuit
ECU
*: 4WD models
HINT:
DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor.
DTC No. 34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
DI98Z−01

R14676
21
R14669
1 2
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−259
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 0.6 − 1.8 kΩ
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MΩ or higher
Rear:
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 0.6 − 2.05 kΩ
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MΩ or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI−234).
OK
2 Check for open and short in harness and connector between each speed sensor
and ECU (See page IN−30).
NG Repair or replace harness or connector.
OK